Question #256283 on Yade changed:
https://answers.launchpad.net/yade/+question/256283
Status: Open => Answered
Chareyre proposed the following answer:
Hi,
On 28/10/14 08:16, Alexander Smith wrote:
> I tested the Hertz Mindlin contact model and noticed that shear and normal
> viscous damping is not accounted for in a sphere-facet contact. It behaves
> correctly with a sphere-sphere contact. I have attached a simple script below
> to illustrate my point. I just wanted to check before I report a bug.
To me it sounds like a bug, but maybe it is intentional. Devs of the
viscous model will tell.
> Also, I noticed that a facet is made of two "triangles" and at the junction
> of the two it appears the sphere is in contact with both surfaces. This
> increases the normal force and effects shear force and contact moments (shown
> by setting a=0 in the script below). Is this correct?
No, it is not correct. It is a known issue of facet-sphere contacts, and
it is more or less solutionless in the context of facets as they are now.
Thus, I would not recommend to try and fix this by yourself.
Some solutions are being implemented and should be released soon. They
replace facets by more advanced shapes.
> I am developing a contact model and I need some guidance on how to fix it to
> ensure that the contact model behaves correctly on flat surfaces.
If the surface is flat, then it can be a single facet, or a a box.
Problem solved (or?).
Bruno
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